Xsf phkeadbephia



/ D. WELLS.

Burglar. Alarm.

No. 12,177. I Patented Jan. 2, 1855.

hem Er; wanes; or PH-T?EADEEPHI?A, EENN'SYU KNM.

BURGLARLNDERJYB s'peeifi'cmom of Eetters Bat'ent Noi- 1a 1 1 dateauanuary-a. 855.

attaching. to the outside" edger ofany ordinary' door a rad'iating;arm having a projection which on the" door being-dissed? catches into a notch on a bolt inthejamb;andonreope ing, the: door. gives the said' bolt a; p'erpen dicul'ar movement communicated by rods or wires to atri'gger: which releases:- a" spring bolt and. thereby sets. in. motion an alarm situated in: any" convenient position:

In order-:to enable others skilled inithe art",

tomake and" use my -invention-l will-now.-

proceed to describe its constructionand' operation. V

In reference to the drawing, Figure.1 .1s a view of my improved apparatus-attached to an ordinary door and l 'jamb with the former partially closed. Fi'g'."2*is"a view of the same with the door in the act of beingv opened. Fig. 3 is a View of the spring bolt and trigger showing'the manner in which it is connected to the latch on the jamb.

The same letters of reference allude to similar parts throughout the several views.

B is the door to the outside edge of which is secured the metallic plate D. At the back of this plate is a radiating arm d the lower end of which works on a pin in the plate, the upper end being provided with a projection 6 standing out at right anglesfrom the arm and protruding through a slotted opening in the plate D. A spring 1 one end of which is secured to the top of the plate and the other end bearing. against the lower end of the arm d serves to maintain the latter in a perpendicular position when not otherwise moved by the closing of the door.

A is the door jamb which has also secured to it a metal plate C. At the back. of this plate is the latch a, which is attached to the plate by means of the arm I) the latter working on a pin in the plate and another pin in the latch a so that the latter can have a perpendicular movement only. Near t e top of the latch a is cut a recess 00 having a notch on he toptof suchja formandj iii such aposion; as to? receive" the projection e' on the irad'lal ar d when the door is closed; The

the" apparatus action rests on the point flthe cam 03' This'cam isallowe'd t'o' turn osely on the plate C'by' means of a key lnserted into the square central hole so that herr the? point: o'ffithe cam is turned in a ori'zont'a'l position as: shown in dotted lines the latch mmayidropdown and'be free gf'rom" contact with: the: projection. e on the gradialf amid" when: the door is opened or closed: To th'e lower" end of thela'tch a 1s secured the wire orcord is which passing ithrough the-floor EfisfconIrected" to the end ;o1-flthe"trrgger*m This trigger works on' a injthe plate; which is attached tothe" latch a;lias'"likewi'sea rojection whi h when gfl' o'or E any 'con'venient' me ans. The short g arm of theatrigger'lever nis notched so'as to .Ereceive' the square end". of thei bolt 0 which 13 slides in" pieces'i on the plat'e G. Round this gboltf'is coiled a iral spri'ngp' one end. of githerw i'i'e composing-which is attached to the fiplate the other" to the bolt in such a maIfifI fil'-l3jtf whength'e" square head-'- is regleased fi'om' contactwi'ththe trigger the bolt-- will he suddenly projected in thedirection' of the arrow.

A spring 8 bearing against the end of the trigger nserves to keep the notch in contact with the bolt 0 when not released by the wire is. I To the end of the bolt is secured a wire (not shown in drawing) communicating with an alarm situated in any convenient position. A bell crank lever m having its fulcrum on the plate G is so arranged in connection with the Wire Z that when the latter is pulled upward the bolt may be forced back to its original position after being discharged as hereinafter described.

Now supposing the apparatus to be in the position shown in Fig. l with the latch a supported on the point of the cam c and the radial arm d in a perpendicular position. On moving the door B toward the jamb A the projection e on theradial arm (Z will come in contact with that portion of the latch a above the recess a. On further moving the door in the direction of the jamb the radial arm-d will be inclined downward in the direction of the slot h in the plate 0 as shown in dot-ted lines. When the door is entirely closed the projection on the arm cl will have dropped into the recess w of the e continuing to retain its place in the recess a: it will be evident that the arm d. will in its tendency to resume a perpendicular position elevate the latch a and with it the wire 7s as shown in Fig. 2. This movement raises one end of the trigger lever n and lowering the other releases the bolt 0 which through the elasticity of the spiral spring is project-. ed suddenly in the direction of the arrow and gives the required movement to the. i H

is shown, it will be easily understood how- ;ever, that any of the numerous well known 5 alarms maybe easily connected by means of iwires and other-suitable conl iect-ions to the gend of the spring bolt 0.-

alarm. i

When it is necessary to restore the spring bolt 0 to its former position the wire Z is raised and with it the long arm of the bellcrank lever on pressing the other arm against the end of the projected bolto and forcing 2 from the opening of doors is old and well known. I do not therefore Wish to claim that exclusively; but

it back until the square head comes again in a contact with the notched end of the trigger n.

The alarm may be so arranged in connection with the spring bolt 0 that it shall con- I to secure by Letters Patent istinue to ring until the wire is raised and the bolt 0 restored to the position shown in J I I and the latch a with its notched recess w for drawing. 2

As it may be frequently required to render the whole apparatus inoperative duringthe' day I efiect this by turning the cam c -in a horizontal position which allows the latch a projection on the radial arm d, thus allowing the door to be opened'or closedlikeany 1 ordinary door without giving an alarm.

the arm d in connection with the latch a, together with the fact of but a slight motion being'required to discharge the trigger combine to render the opening of any door lto which they may .be attached easy, andthe ,actionof the whole almost imperceptible.

In. the: accompanying drawing no .alarm I am well aware that the giving of alarins What I claim. as mylinventiori and desire The radial arm (2 with 'itsiprojection e effecting the disengagement of the spring bolt on the movement of a door oritsequivalent in the manner described and for the purpose specified. to drop and to be free from contact with the DANIEL WELL 

